A rare indigenous sloth of North America that can only be found in the Boston area. There is only one of its knid because it is too ugly to mate with others. But when the culliton matures there is a chance that he/she/it could mate with another animal.

Guy 1: Hey i just myself a new pet
Guy 2: Really, did you get a culliton?
Guy 1: No why would I get one of those ugly things